If you are speaking about Europe, it would be the "Baltic," sea.
After the geology terminology the Black Sea is not an inland Sea.
Adriantic sea, Black sea, Sea of Ozov, Caspian Sea, White Sea, Baltic Sea, Sea of Marmara are some of the landlocked seas in Europe. We can observe these things on a physical map of Europe. Landlocked seas are the water bodies that are surrounded by water by all the sides.
Hudson bay
The fact that it is an open sea among several countries of Europe but definitely is not an "inland" sea like Caspian sea, or the lakes Aral and Baikal.
There is only one inland sea in Europe: the Caspian Sea. Many mistake the Black Sea for being an inland sea, but in fact, it is connected to the Mediterranean Sea.
Northern Europe
Northern Europe and areas around the Black Sea.
No . Paris is an inland city, on the river Seine. In France. Europe.
Northern Europe
The Mediterranean-though it is shared with parts of Asia and Africa. The largest sea entirely in Europe would be the North Sea.
The Baltic Sea.